Implement lists sharing

src/android/mod.rs

@@ -39,9 +39,13 @@ impl MonitorID {
 }
 
 impl Window {
-    pub fn new(_builder: WindowBuilder) -> Result<Window, CreationError> {
+    pub fn new(builder: WindowBuilder) -> Result<Window, CreationError> {
         use std::{mem, ptr};
 
+        if builder.sharing.is_some() {
+            unimplemented!()
+        }
+
         let native_window = unsafe { android_glue::get_native_window() };
         if native_window.is_null() {
             return Err(OsError(format!("Android's native window is null")));

src/lib.rs

@@ -2,6 +2,7 @@
 #![feature(unsafe_destructor)]
 #![feature(globs)]
 #![feature(phase)]
+#![feature(if_let)]
 #![unstable]
 
 //! The purpose of this library is to provide an OpenGL context on as many
@@ -86,7 +87,8 @@ impl std::error::Error for CreationError {
 
 /// Object that allows you to build windows.
 #[cfg(feature = "window")]
-pub struct WindowBuilder {
+pub struct WindowBuilder<'a> {
+    sharing: Option<&'a Window>,
     dimensions: Option<(uint, uint)>,
     title: String,
     monitor: Option<winimpl::MonitorID>,
@@ -97,10 +99,11 @@ pub struct WindowBuilder {
 }
 
 #[cfg(feature = "window")]
-impl WindowBuilder {
+impl<'a> WindowBuilder<'a> {
     /// Initializes a new `WindowBuilder` with default values.
-    pub fn new() -> WindowBuilder {
+    pub fn new() -> WindowBuilder<'a> {
         WindowBuilder {
+            sharing: None,
             dimensions: None,
             title: "glutin window".to_string(),
             monitor: None,
@@ -114,13 +117,13 @@ impl WindowBuilder {
     /// Requests the window to be of specific dimensions.
     ///
     /// Width and height are in pixels.
-    pub fn with_dimensions(mut self, width: uint, height: uint) -> WindowBuilder {
+    pub fn with_dimensions(mut self, width: uint, height: uint) -> WindowBuilder<'a> {
         self.dimensions = Some((width, height));
         self
     }
 
     /// Requests a specific title for the window.
-    pub fn with_title(mut self, title: String) -> WindowBuilder {
+    pub fn with_title(mut self, title: String) -> WindowBuilder<'a> {
         self.title = title;
         self
     }
@@ -128,17 +131,25 @@ impl WindowBuilder {
     /// Requests fullscreen mode.
     ///
     /// If you don't specify dimensions for the window, it will match the monitor's.
-    pub fn with_fullscreen(mut self, monitor: MonitorID) -> WindowBuilder {
+    pub fn with_fullscreen(mut self, monitor: MonitorID) -> WindowBuilder<'a> {
         let MonitorID(monitor) = monitor;
         self.monitor = Some(monitor);
         self
     }
 
+    /// The created window will share all its OpenGL objects with the window in the parameter.
+    ///
+    /// There are some exceptions, like FBOs or VAOs. See the OpenGL documentation.
+    pub fn with_shared_lists(mut self, other: &'a Window) -> WindowBuilder<'a> {
+        self.sharing = Some(other);
+        self
+    }
+
     /// Requests to use a specific OpenGL version.
     ///
     /// Version is a (major, minor) pair. For example to request OpenGL 3.3
     ///  you would pass `(3, 3)`.
-    pub fn with_gl_version(mut self, version: (uint, uint)) -> WindowBuilder {
+    pub fn with_gl_version(mut self, version: (uint, uint)) -> WindowBuilder<'a> {
         self.gl_version = Some(version);
         self
     }
@@ -147,19 +158,19 @@ impl WindowBuilder {
     ///
     /// The default value for this flag is `cfg!(ndebug)`, which means that it's enabled
     /// when you run `cargo build` and disabled when you run `cargo build --release`.
-    pub fn with_gl_debug_flag(mut self, flag: bool) -> WindowBuilder {
+    pub fn with_gl_debug_flag(mut self, flag: bool) -> WindowBuilder<'a> {
         self.gl_debug = flag;
         self
     }
 
     /// Requests that the window has vsync enabled.
-    pub fn with_vsync(mut self) -> WindowBuilder {
+    pub fn with_vsync(mut self) -> WindowBuilder<'a> {
         self.vsync = true;
         self
     }
 
     /// Sets whether the window will be initially hidden or visible.
-    pub fn with_visibility(mut self, visible: bool) -> WindowBuilder {
+    pub fn with_visibility(mut self, visible: bool) -> WindowBuilder<'a> {
         self.visible = visible;
         self
     }

src/osx/mod.rs

@@ -71,6 +71,10 @@ impl Deref<Window> for HeadlessContext {
 #[cfg(feature = "window")]
 impl Window {
     pub fn new(builder: WindowBuilder) -> Result<Window, CreationError> {
+        if builder.sharing.is_some() {
+            unimplemented!()
+        }
+
         Window::new_impl(builder.dimensions, builder.title.as_slice(), builder.monitor, true)
     }
 }

src/win32/init.rs

@@ -15,7 +15,8 @@ local_data_key!(WINDOW: (ffi::HWND, Sender<Event>))
 pub fn new_window(builder_dimensions: Option<(uint, uint)>, builder_title: String,
                   builder_monitor: Option<super::MonitorID>,
                   builder_gl_version: Option<(uint, uint)>, builder_debug: bool,
-                  builder_vsync: bool, builder_hidden: bool) -> Result<Window, CreationError>
+                  builder_vsync: bool, builder_hidden: bool,
+                  builder_sharelists: Option<ffi::HGLRC>) -> Result<Window, CreationError>
 {
     use std::mem;
     use std::os;
@@ -305,10 +306,16 @@ pub fn new_window(builder_dimensions: Option<(uint, uint)>, builder_title: Strin
 
             let ctxt = unsafe {
                 if extra_functions.CreateContextAttribsARB.is_loaded() {
-                    extra_functions.CreateContextAttribsARB(hdc, ptr::null(),
+                    let share = if let Some(c) = builder_sharelists { c } else { ptr::null() };
+                    extra_functions.CreateContextAttribsARB(hdc, share,
                                                             attributes.as_slice().as_ptr())
+
                 } else {
-                    ffi::wgl::CreateContext(hdc)
+                    let ctxt = ffi::wgl::CreateContext(hdc);
+                    if let Some(c) = builder_sharelists {
+                        ffi::wgl::ShareLists(c, ctxt);
+                    };
+                    ctxt
                 }
             };
 

src/win32/mod.rs

@@ -25,7 +25,8 @@ impl HeadlessContext {
     /// See the docs in the crate root file.
     pub fn new(builder: HeadlessRendererBuilder) -> Result<HeadlessContext, CreationError> {
         let HeadlessRendererBuilder { dimensions, gl_version, gl_debug } = builder;
-        init::new_window(Some(dimensions), "".to_string(), None, gl_version, gl_debug, false, true)
+        init::new_window(Some(dimensions), "".to_string(), None, gl_version, gl_debug, false, true,
+                         None)
                          .map(|w| HeadlessContext(w))
     }
 
@@ -69,8 +70,9 @@ impl Window {
     /// See the docs in the crate root file.
     pub fn new(builder: WindowBuilder) -> Result<Window, CreationError> {
         let WindowBuilder { dimensions, title, monitor, gl_version,
-                            gl_debug, vsync, visible } = builder;
-        init::new_window(dimensions, title, monitor, gl_version, gl_debug, vsync, !visible)
+                            gl_debug, vsync, visible, sharing } = builder;
+        init::new_window(dimensions, title, monitor, gl_version, gl_debug, vsync,
+                         !visible, sharing.map(|w| w.window.context))
     }
 }
 

src/x11/window/mod.rs

@@ -248,11 +248,17 @@ impl Window {
                 })
             });
 
+            let share = if let Some(win) = builder.sharing {
+                win.window.context
+            } else {
+                ptr::null()
+            };
+
             let context = if extra_functions.CreateContextAttribsARB.is_loaded() {
                 extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
-                    fb_config, ptr::null(), 1, attributes.as_ptr())
+                    fb_config, share, 1, attributes.as_ptr())
             } else {
-                ffi::glx::CreateContext(display, &mut visual_infos, ptr::null(), 1)
+                ffi::glx::CreateContext(display, &mut visual_infos, share, 1)
             };
 
             if context.is_null() {